I always advise to spay 3 months after first season. The reasoning for this is that spaying before CAN result sometimes in incontinence problems. NOT always. Different vets do advise different things though.

If you have a really good vet whom you trust, you should listen to their advice. Both of my vets have stated that a bitch does not need a first season before being spayed.

If you cannot trust a vet, who can you trust, but that's another question!

__________________

no they dont stop growing she should still get to right size
none of my friends dog have got big and they had them done before their first season

I'm confused too! There is so much conflicting advice - even from vets -as to the best time to spay. My goldendoodle is coming up to 6 months and I do not want to breed her, even if she is gorgeous! After reading copious amounts on the web and talking to vets, I have decided to wait until two months after her first season (not looking forward to that bit - male dogs seem to love her already!!) or 10-11 months, whichever comes first. As quite a big dog, she may not come into season for a while yet. What do I know really?!